components/boot, teams/server: Add partitioning hack for the Raspberry Pi 3

The Raspberry Pi 3 does not recognize a FAT filesystem marked with
the 0xef type, so until we drop support for this device, hack the
partition manually to use a legacy FAT filesystem partition type.

components/boot.xml

@@ -29,7 +29,7 @@
 	<preferences profiles="BootDiskCore" arch="aarch64">
 		<type image="oem"
 		      filesystem="btrfs" btrfs_root_is_subvolume="true" btrfs_set_default_volume="false" fsmountoptions="x-systemd.growfs,compress=zstd:1"
-		      kernelcmdline="rhgb quiet" devicepersistency="by-uuid" force_mbr="true"
+		      kernelcmdline="rhgb quiet" devicepersistency="by-uuid" force_mbr="true" editbootinstall="editbootinstall_rpilegacy.sh"
 		      bootpartition="true" bootpartsize="1024" bootfilesystem="ext4" efipartsize="500" firmware="uefi"
 		      rootfs_label="fedora"
 		      >

editbootinstall_rpilegacy.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+set -euxo pipefail
+
+diskname=$1
+devname="$2"
+loopname="${devname%*p?}"
+loopdev=/dev/${loopname#/dev/*}
+
+#==========================================
+# Force the ESP to use legacy MBR identifier
+#------------------------------------------
+#
+# Raspberry Pi 3 and older systems don't handle
+# the 0xef partition type for the ESP, so switch
+# to the legacy one.
+#
+sfdisk --change-id ${loopdev} 1 6

teams/server.xml

@@ -110,7 +110,7 @@
 	<preferences profiles="ServerDisk" arch="aarch64">
 		<type image="oem"
 		      filesystem="xfs"
-		      devicepersistency="by-uuid" force_mbr="true"
+		      devicepersistency="by-uuid" force_mbr="true" editbootinstall="editbootinstall_rpilegacy.sh"
 		      bootpartition="true" bootpartsize="1000" bootfilesystem="ext4" efipartsize="500" firmware="uefi"
 		      rootfs_label="fedora"
 		      >